muedock



(No Mudel.) 3 Sheets-Sheet 1.

G. JJMURDOCK.

REGULATOR FOE DYNAMO ELECTRIC MACHINES.

No. 281565. Patented Oct. 30, 1883.

INVENTOR.

WITNE$SES: 7 I I I X f 73 Z .W v //v ikTTORNEYS (No Model.) 3 Sheets-Sheet 3.

G. J. MURDOCK.

REGULATOR FOR DYNAMO ELECTRIC MACHINES.

N0. 28?,565. Patented Oct. 30, 1883.

a I llllllllllllllH ullllllllllllll I \lllllllllllllll w WITNESSES: INV/ T0 ATTORNEYS.

' UNITE STAT S PATENT OFFICE.

snorting. MURDOCK," or BiNouAM'roN, NEW YORK.

REGULATOR FOR DYflAMO ELECTRIC MACHINES- srncirrcurox for ing put of Loam Patent No. 287,565, hudomm 888 4 ma est mama) To all whom it may concern: 7

Be it known that I, GEORGE J. MURDOCK, of Binghamton, in the county of Broome and State of New York, have invented certain new and useful Improvements in Regulators for Dynamo-Electric Machines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it apertains to make and use the same, reference ing had to the accompanying drawings, which form a part of this specification.

My invention has relation to dynamo-electric machines, and has for its object the adapconditions without variation of the speed at which their armatures are rotated, but by variation of the intensity of the field-of-force or inducing magnets. As is well known, this class of machines as now perfected are usually constructed on the principle of accumulation of electric energy by mutual action-t'. e., the currentsinduced in the armatures are made to circulate through the coils orhelices of the inducing or field-of-force magnets which induced them. The residual magnetism in the iron of the electro-magneis induces at first a weak current in the helices of the armatures, .and this being returned to the field-of-force magnets increases their power and induces in the armature-helices a correspondingly powerful current, which is again returned to the field-offorce magnets, and this mutual accumulation willcontinue until a point of magnetic saturatiohzis obtained. Any interruption of or variation in the resistance of the external or working circuit will be attended by a corresponding fluctuation of the current. In other words, any addition to the work to be performed by the machine, or any increaseof external resistance-i. a, resistance in the working circuitis. attended by. a diminution of the current strength, while, conversely, any decrease in the resistance of the external circuit is productive of an increased volume of current-that is to say, the current produced by these machines yaries inversely as the work they are called upon to perform. A

I current or uniform strength may be obtained tation of such machines to variable externaleither by varying the speed at which the armatures of the current-producing machine are rotated in a ratio corresponding to the ratio of resistance in the external circuit, or by variation-of the intensity of the magnetic field; and my. invention has relation to apparatus or; current-governors of the last-named classthat is to say, my invention consists in the construction and combination of parts of an apparatus which, without afl'ecting the 6 speed at which thedynamo-electric machine is driven, will automatically lower the electomotive force of the current in circulation-a.

0., working current-by diminishing the in tensity of the field-of-force of the machine 6 proportionate to the diminished external resistance, while, conversely, it will automatically raise the electro-motive force of the current in circulation by increasing the intensity of the field-of-force at a ratio proportionate to the increase of resistance in the external circuit.

1n the accompanying three sheets of drawings, Figure ,1 represents a front elevation of my apparatus. Fig. 2 isavertical sectional 7 5 view of the same, and Fig. 3 is aside elevation of the resistance device which forms part of my apparatus.

Corresponding parts in the several figures are denoted by like letters of reference.

A is a solenoid or helix, composed of a suitable number of coils or layers of insulated copper wire wound upon a tubular bobbin of wood or gutta-percha. I Y

B is an iron core, so adjusted inside of the 8 tubular bobbin as to be drawn upward within the same by the axial magnetism of the helix.

' F is a chamber of iron containing mercury. F is a smaller chamber of iron, containing mercury, and insulated from the central chamber, F, on the other side of which there is an other small chamber, F, also of iron, insulated from chamber F, and similar in construction to chamber F with which it is in electric connection by a wire, X. This chamberalso contains mercury.

G and G are guide-bars, of hard rubber,

which insulate the chambers or reservoirs F, F," and F from one another.

H and H are binding-posts, the former of circuit, in

senses which returns from the field-of-force magnets creases,'the axial magnetism induced in the iron core B by the excited helix A draws up core B, and with it the resistance-pile D, crossbar E, and arms E and E. This causes the level of the mercury contained in chamber F to fall, so that by the combined operations'of raising core B and lowering the level of the mercury, (which are simultaneous and dependcut upon each other,) the resistance to the shunt-circuit is increased, and the amount or volume of current shunted to the fi'eld-of-force magnets reduced, in proportion to the extent to which the core 13 is lifted up within the helix-that is, in proportion to the electro-motive force of the external current fed from the machine. When this force is lowered through increase. of the resistance in the external circuit, (such as the lighting of additional lamps,)

the core B is also lowered, the resistance-pile is immersed to a greater depth into the mercury, and a correspondingly-larger volume of current is shunted oil in the internal circuit to the field-of-force magnets, thus increasing their energy until counterbalanced by the increased volume of current flowing through the external circuit. Thus it will be seen that there is no break or interruption of the current, and that the apparatus is not liable to get into the condition of unstable equilibrium.

As the speed of the generator is not affected by the operation of my regulator or current-f governor, it is impossible for the engine to run away with the dynamo-electric machine or generator when the resistance in the external circuit is diminished by the cuttingout of lamps or from any other course.

Not the least advantage of the apparatus is its simplicity, both of not liable to get out of order.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United States- 1. The combination, in a regulator or ourrent-governor for dynamo-electric machines, of a single helix circuit, and a into the bobbin of the helix'and operated by .sistancepile construction and operation, which makes it very strong, durable, and

to operate automatically,

included within the external vertically-adj ustable resistance device of variable conducting power inserted stantially as and for the purpose sliown and set forth. I y

2. In a regulator or current-governor vfor dynamo-electricmachines, an adjustable resistance-pile built up of rings or disks of varying conducting power, so arranged upon one another as to gradually diminish the resist ance of the pile from an insulator at its bottom to a good conductor tially as and for the purpose set forth.

3. In a regulator or current-governor for dynamo-electric machines, an adjustable reherein shown and sistance-pile built up of rings of varying conducting power, so arranged upon one another between a top and bottom head or disk as'to form an inclosed air-chamber within the pile,

substantially as and for the purpose herein shown and set forth.

4. A regulator or current-governor for dy-x namo-electricmachines, consisting, essentially, of the following elements, viz a helix mountedupon a suitable support and having its terminals connected to oppositepoles of the ex ternal current generated by the armatures of the machine, a movable iron core inserted verat its top, substantically into the helix and provided with means for regulating its vertical play or motion, a reconnected to but insulated from the lower end of the core, which said pile is built up of rings and disks of varying conducting power, regular ratio' from the bottom to the top of the pile, an iron chamber encircling the resistance-pile and containing mercury to establish electrical connection between the cham ber and the resistance-pile, two smaller chambers also containing mercury and connected electrically with each other and with a binding-post connecting with the wire which'returns or conduit connecting the mercury-chamber, inwhich the resistance-pile works, with a bind ing-post connecting with the wire that leaves the commutator going toward the field-of-force magnets, and'an electrical conduit attached to and moving with the movable iron core, but isolated therefrom, and maintaining electric connection, irrespective of the position of the core and resistance-pile, between the latter and the'two smaller mercury-chambers, which are in electrical connection with each other .and with the binding-posts of the shunt-circuit, all constructed, combined, and arranged substantially in the manner and for the purpose described.

In' testimony that I claim the foregoing as my own I have hereunto affixed mysignature in presence of two witnesses.

cnoncn J. MURnocx.

Witnesses: I I

B. N. LooMIs,

W. S. KNOX.

said power increasing in a from the field-of-force magnets, a wire IIO herein shown and (No Model.)

2 Sheets-Sheet 1. G. H. REYNOLDS..

GAS ENGINE.

Patented Oct. 30, 1883 MEN Wily: asses w 

